Engine room fires must be carefully banked during the time of receiving or delivering explosives. No unnecessary fires shall be permitted on vessels while receiving or delivering explosives, and those fires which are deemed necessary must be left in constant charge of some one individual during the entire period in which the explosives are being handled. City Code, 1927, art. 15, §§59(2nd sen.), 61 1950, art. 11, §§61(2nd sen.), 63 1966, art. 10, §§60(2nd sen.), 62 1976/83, art. 10, §§60(2nd sen.), 62 Ord. 13-336